Cooling apparatus for reciprocating pistons



Sept. 26, 1933. c. SCHAER 1,928,033

COOLING APPARATUS FOR RECIPROCATING PISTONS Filed June 30, 1931 Inn/EN TEIF\- 5/241 sJ LM/V /\TTE1 RN 5Y3 Patented Sept. 26, 1933,,

UNlTEDjST'A-TES TE O F E COOLING APPARATUS FOR RECIPROCAT- l v ING-PISTONS .Charles Schaer, Langenthal, Switzerland, as

signor to the firm Sulzer Frres Socit- 'Anonyme, Winterthur, Switzerland Application June 30, 1931, SeriaINoQ 547,878, I

and in Switzerland July 4, 1930 '4 Claims; (01. 123-176) This invention relates to apparatus for cooling reciprocating pistons of the kind in which the V the liquid jet is reduced to a minimum;

One construction of a double actingvvertical internal combustion engine according to this invention is illustrated somewhatdiagrammatically nected by a hollow piston rod 0 to a crosshead d which is in turn connected by a connecting rod e to the crankshaft f. The engine is supportedon the frame g. v The cooling water is supplied through a pipe 1' and injected in the form of a jet k in 'a downward direction towards thereceiving orifice of a pipe I carried by an arm 0 formed integral with or secured to the crosshead (1. Water entering the pipe Z as this reciprocates with the crosshead (1 passes up the hollow piston rod 0 to the interior of the piston 17 whence it is discharged through the telescopically arranged pipes m and n. The conduit 1 preferably takes the 'form of a continuous bore in and for that portion of it which is associated with the arm 0 and the piston rod 0; and the conduit m takes the form of a similar bore parallel to, and spaced laterally from the continuous portions of the conduit 1, in the members c and o, as shown in front elevation in the figure in dotted lines.

wards the column of water constitutingthe jet does not tend to be dispersed into sprayl-as'the receiving pipe moves in the opposite direction to falling, unbroken column and inject it downwardly, unbroken, into' said orifice.

2. In an engine having a vertically reciproeating, 'hollow piston, a piston rod, and an arm extending laterally from the lower end of the .a liquid-jetassociated with the outer end of said ton passes dead center, of cooling agent. thereof, and a fixed piping system adapted to deliver .the fluid in a downwardly-directed, freely- ,piston'rod, a conduit for supplying a cooling me dium to the interior of the piston, said conduit being directed upwardly in the pistonrod into the bottom of. the piston and having its other end extending and openingverticallyoutside the engine, a liquid-jet associated with theouter end I of said conduit and injecting the cooling medium downwardly into the reciprocating free end'of' said conduit, said conduit reciprocating vertically towards and away from said jet, whereby excess 'mediumis ur'gedlto fall downwardly away from the jet and the jet'is caught by said recip rocatingforifice before it can break, -there'byjgire ventingv dispersion of the jet.

3. In an engine having a verticallyreciprocat ing, hollow piston, a piston rod, andan arm' extending laterally from the lower endof the 'pis-; I

ton rod, a conduit for supplying a cooling medium to the interior of the piston, said conduit being tom of the piston andfhaving its otherend ex tending and opening vertically outside theengine,

conduit and injecting, the cooling medium downconduit, said conduit reciprocating vertically to'-' 485"" wardly into the reciprocating free end of said wards and away from saidjet', whereby excess medium is urged to fall downwardly away from the jet and the jet is caught :by'said reciprocatingorifice before itcan break, thereby pre- I venting dispersion of the jet, and an outlet con-v duit extending in said piston rod parallel to and spaced laterally from said first conduit and hav-' ing an end opening outside the engine for draining cooling medium from'said piston. i 4. Inan engine having a reciprocating piston,

a downwardly directed jet of cooling medium-for l cooling the piston, a conduit for conducting the medium from said jet into theflinterior of the piston, said conduit having one portion extending vertically into the lower part :of the piston, an intermediate portion and anotherportion extending substantiallyjvertically into alignment with said 'jet,'said last portion having an aper I p .105. ,ture for intercepting the down-.falling pressure I less jet, and the intermediate portion giving With the other portions, aisubstantiallyvu shape to the conduit whereby'the jet 'is relieved from back- I r pressure reactions tending to come onto it at the receiving orifice of -'the conduit when the fpiscHARL sscH ER.

thereby-preventingloss' 7 

